Nucleosynthesis inside an accretion disk and disk winds related to gamma-ray bursts

Shin Ichirou Fujimoto, Masa-Aki Hashimoto, Kenzo Arai, Ryuichi Matsuba

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

We investigate nucleosynthesis inside both a gamma-ray burst accretion disk and a wind launched from an inner region of the disk using one-dimensional models of the disk and wind. Far from a central black hole, the composition of accreting gas is taken to be that of an Si-rich or O-rich layer of a massive star before core collapse. We find that the inner region of the disk comprises five layers characterized by dominant elements: 16O, 28Si, 54Fe (and 56Ni), 4He, and nucleons. As the accretion rate decreases, the individual layers shift inward, retaining the overall profiles of compositions. A massive amount of 56Ni, over 0.1 M⊙., is ejected through the wind from the disk where the electron fraction ≃0.5. The amount of 56Ni produced through the disk wind can be responsible for the light curves observed at the late stage in hypernovae (HNe). The yields of elements heavier than Ca produced via the disk wind are comparable to or greater than those of a normal supernova and their composition is similar to that of an aspherical HN explosion. A significant amount of Ga, Ge, and Se is ejected from the disk. A variety of neutron-rich elements, as well as p-nuclei, are also appreciably produced through the disk wind.

Original languageEnglish
Pages (from-to)847-857
Number of pages11
JournalAstrophysical Journal
Volume614
Issue number2 I
DOIs
Publication statusPublished - Oct 20 2004

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nuclear fusion
gamma ray bursts
accretion disks
accretion
explosion
heavy elements
retaining
massive stars
nucleons
light curve
supernovae
explosions
electron
gas
neutrons
nuclei
shift
profiles
gases
electrons

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Nucleosynthesis inside an accretion disk and disk winds related to gamma-ray bursts. / Fujimoto, Shin Ichirou; Hashimoto, Masa-Aki; Arai, Kenzo; Matsuba, Ryuichi.

In: Astrophysical Journal, Vol. 614, No. 2 I, 20.10.2004, p. 847-857.

Research output: Contribution to journalArticle

Fujimoto, SI, Hashimoto, M-A, Arai, K & Matsuba, R 2004, 'Nucleosynthesis inside an accretion disk and disk winds related to gamma-ray bursts', Astrophysical Journal, vol. 614, no. 2 I, pp. 847-857. https://doi.org/10.1086/423778
Fujimoto, Shin Ichirou ; Hashimoto, Masa-Aki ; Arai, Kenzo ; Matsuba, Ryuichi. / Nucleosynthesis inside an accretion disk and disk winds related to gamma-ray bursts. In: Astrophysical Journal. 2004 ; Vol. 614, No. 2 I. pp. 847-857.
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